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Correlation between the plasma and pericardial fluid (PF) levels of anti‐citrate synthase (anti‐CS) natural autoantibodies. Significant correlations were detected in the levels of anti‐CS immunoglobulin (Ig)M in the plasma versus PF (P < 0·001) (a), as well as in the anti‐CS IgG levels in plasma versus PF (P < 0·001) (b).
